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Lug Width Helper
Lug width is the one number you must get right before buying a strap. It is the gap between the lugs where the strap sits, measured in millimeters. Confirm your size below and we will tell you what to measure and where to browse next.
Guidance on how to measure, not a database of specific watch models. Always measure your own watch.
How to find your lug width
- 1 The lug width is the gap between the two lugs, where the strap sits and the spring bar seats. It is not the case diameter.
- 2 Measure across the inside faces of the lugs at the spring bar, in millimeters. Digital calipers are the most accurate; a flat millimeter ruler viewed straight down works for most people.
- 3 If you still have the original strap, the width is often stamped near the lug end. You can also check the watch spec sheet or caseback markings.
- 4 Round to the nearest whole millimeter. Watch straps are sold in whole-mm widths, so your strap must match the gap exactly. Even 1mm off looks wrong or will not seat.
Common widths at a glance
| Width | Notes |
|---|---|
| 18mm | Common on smaller dress watches and some field watches. |
| 19mm | Less common, an odd size. Confirm carefully before ordering, as 19mm straps are harder to find. |
| 20mm | The most common width across dress and sport watches. |
| 21mm | Uncommon. A few sport and dress references use it. Double-check before you buy. |
| 22mm | Very common on dive and tool watches. |
| 24mm | Larger sport, pilot, and oversized cases. |
We do not list lug widths for specific watch models on purpose. The same model can change width across references and production years, so measuring your own watch is the only reliable method. For a deeper walkthrough, read how to measure watch lug width.